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1668640 = 25510429
BaseRepresentation
bin110010111011000100000
310010202221111
412113120200
5411344030
655433104
720116561
oct6273040
93122844
101668640
11a3a746
12685794
1346567c
14316168
1522e62a
hex197620

1668640 has 24 divisors (see below), whose sum is σ = 3942540. Its totient is φ = 667392.

The previous prime is 1668629. The next prime is 1668647. The reversal of 1668640 is 468661.

It can be written as a sum of positive squares in 2 ways, for example, as 1547536 + 121104 = 1244^2 + 348^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1668647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5055 + ... + 5374.

21668640 is an apocalyptic number.

1668640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1668640 is an abundant number, since it is smaller than the sum of its proper divisors (2273900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668640 is a wasteful number, since it uses less digits than its factorization.

1668640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10444 (or 10436 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1668640 is about 1291.7584913597. The cubic root of 1668640 is about 118.6098846017.

The spelling of 1668640 in words is "one million, six hundred sixty-eight thousand, six hundred forty".

Divisors: 1 2 4 5 8 10 16 20 32 40 80 160 10429 20858 41716 52145 83432 104290 166864 208580 333728 417160 834320 1668640